Vertical SaaS vs Custom Build (2026)

The verdict in three sentences

A vertical SaaS (specialized industry software) is the right call as long as its subscription stays below the amortized cost of custom and it covers more than 80% of your needs. A custom build at 40,000-130,000 EUR excl. VAT becomes rational when the subscription durably exceeds 1,500 EUR excl. VAT/month, when functional coverage plateaus, or when vendor dependence threatens your business. The tipping point is calculable: it's the month cumulative subscriptions cross the amortized cost of custom.

Subscription vs CAPEX: the real math

Vertical is OPEX that swells with your volumes and users. Custom is CAPEX to amortize, with stable maintenance. The choice hinges on your cost trajectory, not the first-year sticker price.

A vertical at 1,500 EUR excl. VAT/month is 18,000 EUR excl. VAT/year, or 90,000 EUR excl. VAT over 5 years. A custom build at 70,000 EUR excl. VAT plus 1,000 EUR excl. VAT/month maintenance comes to 130,000 EUR excl. VAT over 5 years: vertical still wins. But if the subscription climbs to 3,000 EUR excl. VAT/month with growth, vertical hits 180,000 EUR excl. VAT over 5 years and custom becomes cheapest.

The tipping point, concretely

The math is simple: add up your cumulative vertical subscriptions, project them over 3 to 5 years accounting for user growth, and compare to the amortized cost of custom.

Beyond price alone, three signals push toward custom: coverage plateauing (you work around the software with spreadsheets), vendor dependence (price hikes, a roadmap ignoring your needs, shutdown risk), and data you don't control.

Mini case study

Sophie, operations director of a 40-employee services SMB, uses a vertical software billed 2,400 EUR excl. VAT/month, i.e. 28,800 EUR excl. VAT/year. With her growth, the vendor announced +20% next year, pushing the subscription toward 34,000 EUR excl. VAT/year. Over 5 years, accounting for hikes, vertical exceeds 175,000 EUR excl. VAT. A custom build covering 100% of her processes, priced at 90,000 EUR excl. VAT plus 1,200 EUR excl. VAT/month maintenance, comes to 162,000 EUR excl. VAT over 5 years, with no forced hikes and full data control. The tipping point falls in year 3: she launches custom.

FAQ

Is vertical always faster to deploy? Yes, that's its main edge: immediate to a few weeks, versus 3-7 months for custom. If you need to be operational tomorrow, start on a vertical, even if you switch later.

How do we assess vendor dependence? Look at the share of your business riding on the software, how easily you can export your data, the price-hike history and the vendor's financial health. Heavy dependence on a fragile vendor is a real business risk.

Can we start vertical then move to custom? It's the most common and wisest scenario: validate the need on a vertical, then custom-build the brick that becomes strategic once the tipping point is reached.

From what subscription does custom make sense? As a 2026 order of magnitude, above a durable 1,500-2,000 EUR excl. VAT/month, the calculation deserves serious work, especially if functional coverage plateaus.

Does custom really cover 100% of the need? Yes by definition, since it's built on your processes. That's its edge over vertical, which imposes its standards. The trade-off is time and upfront CAPEX.

Let's scope your project. Send us your current vertical subscription and functional limits: we compute your tipping point and frame a custom build between 40,000 and 130,000 EUR excl. VAT. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.